Method for preparing polyether imide/barium titanate/graphene dielectric composite materials

Abstract

The invention discloses a method for preparing polyether imide / barium titanate / graphene dielectric composite materials. The method particularly includes steps of 1), mixing ethyl alcohol and polyetherimide with each other according to certain proportions to prepare polyether imide solution, uniformly dispersing graphene and barium titanate (BaTiO3, BT) in the polyether imide solution by the aid of physical dispersion processes and carrying out ultrasonic cell smashing treatment for 20-25 min to obtain polyether imide / barium titanate / graphene mixed solution; 2), carrying out heat treatment onthe mixed solution under vacuum conditions at the temperatures of 90-100 DEG C for 2-2.5 h to remove ethyl alcohol solvents and water, then adding curing agents into the mixed solution, and uniformlystirring and mixing the curing agents and the mixed solution with one another to obtain curing systems; 3), carrying out vacuum degassing on the curing systems at the room temperature for 30-35 min, then carrying out heat curing at the temperatures of 45-55 DEG C for 4-5 h, and carrying out curing at the temperatures of 90-100 DEG C for 5-6 h to obtain the polyether imide / barium titanate / graphenedielectric composite materials. The method has the advantages that the method includes simple technologies and is short in preparation cycle, and the polyether imide / barium titanate / graphene dielectric composite materials prepared by the aid of the method have high dielectric constants.

Description

technical field [0001] The invention relates to the technical field of dielectric composite material preparation, in particular to a preparation method of polyetherimide / barium titanate / graphene dielectric composite material. Background technique [0002] Polymer materials have many advantages, such as high strength, light weight, good processing performance, good electrical insulation performance, good toughness, and low price, etc., and are being widely used in many fields. However, polymer materials have poor processability, poor aging resistance, poor high temperature performance, certain limitations in strength, easy stress relaxation and creep, and low dielectric constant. Since the 21st century, the tremendous development of science and technology has driven the progress of various industries, which has limited the use of traditional polymer materials. At this time, the effective compounding of polymer materials, metal materials, and inorganic non-metallic materials ...

AI Technical Summary

Problems solved by technology

However, dielectric ceramic / polymer composite materials and conductor / polymer composite materials have their own characteristics. The former generally needs to add a high content of dielectric ceramics to obtain a high dielectric constant, which is not conducive to processing, and the sintering temperature is too high. At the same time, it may lead to poor flexibility and mechanical properties of the material, which will reduce the service life and material stability, and the dielectric loss of the latter is relatively high.